Next think of a place or moment in time when you felt completely relaxed. In your mind focus on the imagery and go there again or create a new place of your own thats perfectly relaxing, maybe your perfect place is made up of multiple places or things. An example may be laying out at a warm sandy beach in the ocean breeze.
You can do this for as long as you like, if this is your first time try starting out with 20-30 minutes. If you practice often you may only need 5-10 minutes to get to a relaxed state.
Here are some photos of my trip to Greece, this is an example of my personal inspirational photos for imagery and relaxation:
Created with Admarket's flickrSLiDR.